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International Conference on Ultrafast Phenomena

Quantum control of two-photon fluorescence in solution

Daniel G. Kuroda, Valeria D. Kleiman

Published Jan 1, 2006• 0 citations
Publisher

Abstract

A novel, compact, and high-resolution phase modulator in reflective mode is presented and used to coherently control two-photon fluorescence of Rhodamine 6G in solution. Two pulses sets that minimize or maximize the fluorescence are found.
DOI
10.1364/up.2006.the2

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By using an intensity correlation, or photon coincidence, technique and a Mach-Zehnder interferometer with artificially applied phase fluctuations in one arm, we measured the coherence time of a thermal light beam. The light was derived from the filtered fluorescence of a rhodamine 6G dye solution. The two-photon coincidence rate was measured as a function of path difference and was found to dip 50% when the two arms of the interferometer are balanced. The coherence time of ~100 fs is determined from the measured width of the dip and is consistent with the passband of the filters. The method does not require the stability needed in second-order interference measurements, and its time resolution can be much shorter than that of the photodetectors. The theory of this type of fourth-order interference technique is discussed.